CN105846943A - Data stream delimitation method and device - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
Embodiments of the invention disclose a data stream delimitation method and device. The method comprises the following steps of receiving code words of a lead code for sending lead code data stream; and delimitating the uplink data stream according to a preset delimiter when the number of the received code words of the lead code reaches a preset value. A window for searching the delimiter can be adaptively adjusted according to the uplink data stream, so that the embodiments of the invention help to solve or reduce a problem of loss of an uplink data packet, which is caused by being unable to search the delimiter in a set delimiter search time window, and thus the success rate for data stream delimitation and the system performance are improved.
Description
Technical Field
The present invention relates to Passive Optical Network (PON) technologies, and in particular, to a method and an apparatus for delimiting data streams.
Background
In a PON system, data transmitted from an Optical Network Unit (ONU) to an Optical Line Terminal (OLT) is defined as upstream data, which is also called upstream burst, and a frame structure of the upstream data is shown in fig. 1. Data sent from the OLT to the ONU units is called downstream data. The present PON system adopts a Time Division Multiple Access (TDMA) technique for uplink data transmission. And each ONU transmits the upstream data according to the starting time and the ending time of transmitting the upstream data, which are informed by the OLT. After receiving the uplink data of each ONU, the OLT needs to perform accurate delimitation on the data, analyze a GTC frame and a GEM frame, and send the data to other network units on the line side after realizing recombination and encapsulation.
It can be seen that the success or failure of delimitation of the data stream is a decisive factor for the subsequent deframing of the data. Fig. 2 is a schematic structural diagram of a conventional delimiter control circuit, and referring to fig. 2, in a conventional processing manner, a counter is used as a timer in an OLT, and a time window for searching for a delimiter by a delimiter module is controlled in a one-way control manner in combination with an uplink data transmission time configured for an ONU. And the OLT delimitation module performs cross-correlation operation on the uplink data stream and a locally configured/stored delimitator (Delimiter) according to the window time control signal, and the delimitator is considered to be searched when the cross-correlation operation result exceeds a set threshold value.
However, with the above method for delimiting data stream, when some uncontrollable factors occur, for example, the transmission fiber is crushed and deformed to cause delay of the optical module in decoding the optical signal, so that the time when the delimiter reaches the OLT drifts, which may cause that the delimiter cannot be searched within the search delimiter time window set by the OLT for the ONU, then the upstream data packet will be lost.
Disclosure of Invention
In view of this, in order to solve the existing technical problems, embodiments of the present invention provide:
a method of data stream delimitation, comprising:
receiving a preamble code word for transmitting a preamble data stream;
and when the number of the received lead code words reaches a preset value, delimiting the uplink data stream according to a preset delimiter.
In an embodiment, before receiving the preamble codeword for transmitting the preamble data stream, the method further includes:
performing preamble identification on the uplink data stream;
sending a lead code data stream by a lead code word in a preset format;
in one embodiment, the method further comprises:
converting an optical signal from the ONU into an electrical signal;
and performing clock and data recovery on the electric signal to obtain an uplink data stream.
In a specific embodiment, the performing preamble identification on an uplink data stream includes:
when the format of the uplink data is consistent with a preset preamble format, determining the uplink data as preamble data; and when the format of the uplink data is inconsistent with the preset lead code format, performing format conversion on the uplink data according to a preset algorithm, and if the format of the converted uplink data is consistent with the preset lead code format, determining the converted uplink data as the lead code data.
In one embodiment, the method further comprises: and when the format of the uplink data or the converted format of the uplink data is inconsistent with the preset preamble code format, stopping sending the preamble code word of the preset format to the preamble code word.
An embodiment of the present invention further provides a data stream delimiting device, including: a lead code detection unit and a delimitation correlation unit; wherein,
the preamble detection unit is configured to receive a preamble codeword for transmitting a preamble data stream; judging whether the number of the received lead code words reaches a preset value or not, and sending a wake-up signal to the delimitation correlation unit when the number of the received lead code words reaches the preset value is determined;
and the delimitation correlation unit is used for delimitating the cached uplink data stream according to a preset delimitation symbol after receiving the wake-up signal from the lead code detection unit.
In one embodiment, the apparatus further comprises a preamble position adjustment unit,
and the lead code position adjusting unit is used for carrying out lead code identification on the uplink data stream and sending the lead code data stream to the lead code detecting unit by using lead code words in a preset format.
In one embodiment, the apparatus further comprises an upstream burst clock data recovery unit,
the uplink burst clock data recovery unit is configured to perform clock and data recovery on the ONU electrical signal to obtain an uplink data stream, where the ONU electrical signal is obtained by converting an optical signal from an ONU.
In a specific embodiment, the preamble position adjusting unit is specifically configured to determine that the uplink data is preamble data when a format of the uplink data is consistent with a preset preamble format; and when the format of the uplink data is inconsistent with the preset lead code format, performing format conversion on the uplink data according to a preset algorithm, and if the format of the converted uplink data is consistent with the preset lead code format, determining the converted uplink data as the lead code data.
In a specific embodiment, the preamble position adjusting unit is further configured to stop sending the preamble data stream by using the preamble codeword in the preset format when the format of the uplink data or the converted format of the uplink data is inconsistent with the preset preamble format.
The data stream delimitation method and the device of the embodiment of the invention receive and send lead code words of lead code data streams; and when the number of the received lead code words reaches a preset value, delimiting the uplink data stream according to a preset delimiter. The window of the search delimiter can be adjusted in a self-adaptive manner according to the uplink data stream, so that the embodiment of the invention is beneficial to solving or reducing the problem that the uplink data packet is lost due to the fact that the delimiter cannot be searched in the set time window of the search delimiter, thereby improving the success rate of the data stream delimitation and improving the system performance.
Drawings
Fig. 1 is a schematic diagram of a PON upstream burst frame structure;
FIG. 2 is a schematic diagram of a conventional delimited control circuit;
FIG. 3 is a schematic flow chart of a data stream delimiting method according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating a further data stream delimiting method according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart illustrating a further data stream delimiting method according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a data stream delimiting apparatus according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a data stream delimiting apparatus according to another embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a data stream delimiting apparatus according to another embodiment of the present invention;
fig. 9 is a schematic diagram of a data processing flow of a delimiting correlation unit in the embodiment of the present invention.
Detailed Description
In order to effectively improve the success rate of delimiting data streams sent by an ONU to an OLT and improve system performance, embodiments of the present invention provide a method and an apparatus for delimiting data streams.
Fig. 3 is a schematic flow chart of a data stream delimiting method according to an embodiment of the present invention, and as shown in fig. 3, the method includes:
step 301: receiving a preamble code word for transmitting a preamble data stream;
step 302: and when the number of the received lead code words reaches a preset value, delimiting the uplink data stream according to a preset delimiter.
It should be noted that, before the number of received preamble code words reaches a preset value, the preamble code words need to be continuously received and the number of received preamble code words needs to be counted.
In an embodiment, as shown in fig. 4, before receiving the preamble codeword of the preamble data stream, the method further includes:
step 401: performing preamble identification on the uplink data stream;
in a specific embodiment, the performing preamble identification on an uplink data stream includes:
when the format of the uplink data is consistent with a preset preamble format, determining the uplink data as preamble data; and when the format of the uplink data is inconsistent with the preset lead code format, performing format conversion on the uplink data according to a preset algorithm, and if the format of the converted uplink data is consistent with the preset lead code format, determining the converted uplink data as the lead code data.
In one embodiment, the method further comprises: and when the format of the uplink data or the converted format of the uplink data is inconsistent with the preset preamble code format, stopping sending the preamble code word of the preset format to the preamble code word.
Step 402: sending a lead code data stream by a lead code word in a preset format;
in one embodiment, as shown in fig. 5, the method further includes:
step 501: converting an optical signal from the ONU into an electrical signal;
step 502: and performing clock and data recovery on the electric signal to obtain an uplink data stream.
An embodiment of the present invention further provides a data stream delimiting device, as shown in fig. 6, the device includes: a preamble detection unit 601 and a delimitation correlation unit 602; wherein,
the preamble detection unit 601 is configured to receive a preamble codeword for sending a preamble data stream, and complete statistics on the number of configured codewords; judging whether the number of the received lead code words reaches a preset value or not, and sending a wake-up signal to the delimitation correlation unit when the number of the received lead code words reaches the preset value is determined; here, to avoid missed detection, the default value for the number of preamble code words compared by the preamble detection unit may be reduced, so that the wake-up signal can be sent to the boundary correlation unit earlier for cross-correlation.
The delimitation correlation unit 602 is configured to delimitate the buffered uplink data stream according to a preset delimiter after receiving the wake-up signal from the preamble detection unit.
Specifically, the delimitation correlation unit 602 may perform cross-correlation operation on the locally stored/configured delimiter and the uplink data stream according to the delimitation wake-up signal of the preamble detection unit 601, and when a result of the cross-correlation operation reaches a specified (configurable) threshold value, that is, the delimitation is successful, the delimitation correlation unit 602 module sends the remaining data stream, from which the preamble (preamble) and the delimiter (delimiter) are removed, in the uplink burst to the system post-processing unit. It should be noted that, the inside of the delimitation correlation unit 602 buffers the data sent by the uplink burst clock data recovery unit, the depth of the data buffer is equal to the sum of the data amount in the time required by the processing of the preamble position adjustment unit and the preamble detection unit, and when the wakeup signal is valid, the data is immediately subjected to correlation operation. When any group of cross-correlation detection results reach a set threshold value, the delimitation is considered to be successful. The user can configure the local delimiters (delimiters) in the delimitation related units to meet the customization requirements.
In one embodiment, as shown in fig. 7, the apparatus further includes a preamble position adjusting unit 701,
the Preamble position adjusting unit 701 is configured to perform Preamble (Preamble) identification on an uplink data stream, and send the Preamble data stream to the Preamble detection unit by using a Preamble codeword with a preset format. Specifically, after the preamble position adjustment unit 701 completes the identification of the preamble, the preamble code words in the alternate format of one binary data stream 0/1 are fixed to send the preamble data stream to the preamble detection unit 601, and the format of the preamble code words may be preset, for example, the preamble code words are set to binary digits (0101) B, and the code words are represented as 5H in hexadecimal.
In a specific embodiment, the preamble position adjusting unit 701 is specifically configured to determine that the uplink data is preamble data when a format of the uplink data is consistent with a preset preamble format; and when the format of the uplink data is inconsistent with the preset lead code format, performing format conversion on the uplink data according to a preset algorithm, and if the format of the converted uplink data is consistent with the preset lead code format, determining the converted uplink data as the lead code data.
Here, according to ITU-T g.984.3, the preamble is fixed to appear in 0/1 alternate binary data stream 010101 … …, while the data recovered from BCDR may appear in both 010101 … … and 101010 … …, when appearing in 101010 … …, it needs to be adjusted to 010101 … … data format, and then, each time the data with corresponding length is intercepted according to the preset preamble code word format, the data is sent to the preamble detection unit 601, for example, 4 bits (0101) B can be intercepted at a time.
In a specific embodiment, the preamble position adjusting unit 701 is further configured to, in each uplink burst, stop sending the preamble data stream with the preamble codeword in the preset format when the format of the uplink data or the format of the converted uplink data is inconsistent with the preset preamble format.
In one embodiment, as shown in fig. 8, the apparatus further includes an upstream burst clock data recovery unit 801,
the upstream Burst Clock and Data Recovery unit (BCDR) 801 is configured to perform Clock and Data Recovery on an ONU electrical signal to obtain an upstream Data stream, where the ONU electrical signal is obtained by converting an optical signal from an ONU. When the ONU transmits data to the OLT, the data enters the optical module of the OLT in the form of an optical signal, the optical module converts the optical signal into an electrical signal and transmits the electrical signal to the BCDR, and the BCDR completes clock recovery and data recovery of the electrical signal.
It should be noted that the starting position of the delimiter in the uplink data cannot be determined, and therefore the position of the delimiter needs to be accurately found in the data stream to complete the subsequent frame decoding. The delimiter correlation unit 602 finds the exact position of the delimiter in the data stream, and the data processing flow is shown in fig. 9. Fig. 9 illustrates the principle of the correlation detection unit in the process only by taking the delimiter length as an example. The data output by the uplink burst clock data recovery unit is sent to a delimitation correlation unit, firstly, the data passes through an input buffer, then passes through two groups of register groups B and A, the group A and the group B form 16-bit data in a fixed combination form and are sent to 16 groups of correlation detection units, the data streams in the 16 combination forms are simultaneously sent to a data selector, and the data selector selects one of the data streams as output data of the delimitation correlation unit. The 16 sets of correlation detection units work in parallel. The function of the correlation detection unit is to perform an exclusive nor operation on two sets of input data according to bits (one of the logic operations, if the two inputs are the same, the operation result is 1, otherwise, the operation result is 0), then add the results of each exclusive nor operation, and the value obtained by the addition is called the correlation detection result. The maximum value of the correlation detection result is the width of the input data, i.e. it means that the two sets of data are equal. The data selector selects one of a plurality of data splicing forms as a delimited output result according to the relevant detection result and the allowable error bit number. For example, when the first bit of a 16-bit delimiter in the received data stream appears in a [0] and there is no error in the data stream, it will be the same as each bit of the locally configured delimiter in the correlation detection unit 0, and the correlation result of the set of correlation detection units is 16, that is, it indicates that the splicing form of the upstream burst data stream is the same as the form of the input correlation detection unit 0, then the data selector will select.
Each Unit may be implemented by a Central Processing Unit (CPU), a Digital Signal Processor (DSP), or a Programmable logic Array (FPGA) in the electronic device.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. A method for delimiting a data stream, the method comprising:
receiving a preamble code word for transmitting a preamble data stream;
and when the number of the received lead code words reaches a preset value, delimiting the uplink data stream according to a preset delimiter.
2. The method of claim 1, wherein prior to receiving the preamble codeword for the transmitted preamble data stream, the method further comprises:
performing preamble identification on the uplink data stream;
and transmitting the preamble code word in a preset format to the preamble code word.
3. The method according to claim 1 or 2, characterized in that the method further comprises:
converting an optical signal from the ONU into an electrical signal;
and performing clock and data recovery on the electric signal to obtain an uplink data stream.
4. The method of claim 2, wherein the performing preamble identification on the uplink data stream comprises:
when the format of the uplink data is consistent with a preset preamble format, determining the uplink data as preamble data; and when the format of the uplink data is inconsistent with the preset lead code format, performing format conversion on the uplink data according to a preset algorithm, and if the format of the converted uplink data is consistent with the preset lead code format, determining the converted uplink data as the lead code data.
5. The method of claim 4, further comprising: and when the format of the uplink data or the converted format of the uplink data is inconsistent with the preset preamble code format, stopping sending the preamble code word of the preset format to the preamble code word.
6. An apparatus for delimiting a data stream, the apparatus comprising: a lead code detection unit and a delimitation correlation unit; wherein,
the preamble detection unit is configured to receive a preamble codeword for transmitting a preamble data stream; judging whether the number of the received lead code words reaches a preset value or not, and sending a wake-up signal to the delimitation correlation unit when the number of the received lead code words reaches the preset value is determined;
and the delimitation correlation unit is used for delimitating the cached uplink data stream according to a preset delimitation symbol after receiving the wake-up signal from the lead code detection unit.
7. The apparatus of claim 6, further comprising a preamble position adjustment unit,
and the lead code position adjusting unit is used for carrying out lead code identification on the uplink data stream and sending the lead code data stream to the lead code detecting unit by using lead code words in a preset format.
8. The apparatus of claim 6 or 7, further comprising an upstream burst clock data recovery unit,
the uplink burst clock data recovery unit is configured to perform clock and data recovery on the ONU electrical signal to obtain an uplink data stream, where the ONU electrical signal is obtained by converting an optical signal from an ONU.
9. The apparatus of claim 7,
the preamble position adjusting unit is specifically configured to determine that the uplink data is preamble data when a format of the uplink data is consistent with a preset preamble format; and when the format of the uplink data is inconsistent with the preset lead code format, performing format conversion on the uplink data according to a preset algorithm, and if the format of the converted uplink data is consistent with the preset lead code format, determining the converted uplink data as the lead code data.
10. The apparatus of claim 9,
and the preamble position adjusting unit is further configured to stop sending the preamble data stream by the preamble code word in the preset format when the format of the uplink data or the converted format of the uplink data is inconsistent with the preset preamble format.
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|---|---|---|---|
| CN201510019425.1A CN105846943A (en) | 2015-01-15 | 2015-01-15 | Data stream delimitation method and device |
| PCT/CN2015/082553 WO2016112646A1 (en) | 2015-01-15 | 2015-06-26 | Data flow delimiting method, device and computer storage medium |
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| CN201510019425.1A CN105846943A (en) | 2015-01-15 | 2015-01-15 | Data stream delimitation method and device |
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Cited By (1)
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| CN107969029A (en) * | 2016-10-19 | 2018-04-27 | 华为技术有限公司 | One kind wakes up pilot code generation method, synchronous method and device |
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Application publication date: 20160810 |